tools: precompile block-generator teal code

[winder]

Summary

Observed that the block generator was taking 3-10 seconds to generate app-heavy scenarios. After inspecting the code I found that the teal program was being compiled over and over again.

Testing

Added timing instrumentation to measure the performance impact with the stress.50000.yml benchmark scenario.

The generation time was reduced from 7 seconds to 250ms.

Code review video: https://youtu.be/JlYhksWUBKU

[codecov]

Codecov Report

Merging #5642 (5e31835) into master (95e3504) will decrease coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5642      +/-   ##
==========================================
- Coverage   55.01%   54.98%   -0.04%     
==========================================
  Files         463      463              
  Lines       64513    64513              
==========================================
- Hits        35495    35471      -24     
- Misses      26640    26658      +18     
- Partials     2378     2384       +6     

see 8 files with indirect coverage changes

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[tzaffi]

great improvement